I noticed one of my chickens being picked on. It has black sores and bloody scabs all over its head. Its face is swollen and it can barely see out of its eye. I have a picture of it below. I separated it from the rest and put neosporin on the wounds and the swelling seems to be getting better today. It eats fine now that I have it away from the rest of the flock. I just noticed today another chicken is getting the same black scabs on its face but not as bad. Are my chickens sick or are they being picked on?